51.   The bad weather conditions prevented the plane from landing.

52.   Weather conditions were fair.

53.   ...favourable weather conditions.

54.   They use computer simulation to predict weather conditions.

55.   Weather conditions had improved, but they were not perfect.

56.   The project however had been virtually completed, a remarkable achievement considering the weather conditions.

57.   The ground was frozen, and digging foundations was practically impossible in such drastic weather conditions.

58.   All films showed bright dry weather conditions and moderate to light levels of traffic.

59.   They were very susceptible to weather conditions.

60.   We are sorry Q.T. day had to be cancelled but because the weather conditions were so bad we felt it was the right thing to do.